Suzuki XL7 2007 Service Manual page 244

1A-139 Engine General Information and Diagnosis:
Circuit/System Testing
1. If any other IPC indicators or gages are inoperative,
refer to "Instrument Cluster Gages Inoperative: ".
2. Ignition OFF, disconnect the ECM harness
connectors. Ignition ON, the MIL should not
illuminate.
➢ If the MIL is illuminated, test the MIL control circuit
for a short to ground. If the circuit tests normal,
replace the IPC.
3. Ignition ON, connect a 3A fused jumper wire
between the MIL control circuit and ground. The MIL
should illuminate.
➢ If the MIL does not illuminate, test the MIL control
circuit for a short to voltage, or an open/high
resistance. If the circuit test normal, replace the
IPC/bulb.
4. If all circuits/connections test normal, replace the
ECM.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Instrument Cluster Replacement: "
• "Control Module References: " for engine control
module replacement, setup, and programming
DTC P0652 or P0653
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle
Diagnostic Information: " prior to using this diagnostic
procedure.
• Review "Strategy Based Diagnosis: " for an overview
of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle
Diagnostic Information: " provides an overview of
each diagnostic category.
DTC Descriptors
DTC P0652: 5 Volt Reference 2 Circuit Low Voltage
DTC P0653: 5 Volt Reference 2 Circuit High Voltage
Circuit/System Description
The engine control module (ECM) has 3 5-volt reference
circuits. The ECM provides the 5-volt reference to
various sensors. Each reference circuit provides a 5-volt
reference for more than one sensor. A short to ground or
voltage on one of the 5-volt reference circuits will affect
all components connected to that 5-volt reference circuit.
The ECM monitors the voltage on the 5-volt reference
circuits.
Conditions for Running the DTC
• The ignition is ON for more than 3 seconds.
• DTCs P0652 and P0653 run continuously when the
above condition is met.
Conditions for Setting the DTC
The 5-volt reference 2 voltage is above or below a
predetermined threshold for more than 4 seconds.
Action Taken When the DTC Sets
DTCs P0652 and P0653 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0652 and P0653 are Type A DTCs.
Diagnostic Aids
The 5-volt reference 2 circuit provides 5 volts to the
following sensors:
• All four camshaft position (CMP) sensors
• Accelerator pedal position (APP) sensor 1
Reference Information
Schematic Reference
"Engine Controls Schematics"
Connector End View Reference
• "Engine Control Module Connector End Views"
• "Engine Controls Connector End Views"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
DTC Type Reference
"Powertrain Diagnostic Trouble Code (DTC) Type
Definitions"
Scan Tool Reference
• "Scan Tool Data List - Engine Controls - 3.6L (LY7)"
• "Scan Tool Data Definitions - Engine Controls - 3.6L
(LY7)"
• "Scan Tool Output Controls - Engine Controls - 3.6L
(LY7)"
Circuit/System Verification
1. Ignition ON, observe the DTC information with a
scan tool. DTCs P0652 and P0653 should not set.
2. If the vehicle passes the Circuit/System Verification
test, operate the vehicle within the conditions for
running the DTC. You may also operate the vehicle
within the conditions that are captured in the Freeze
Frame/Failure Records List.